vBulletin vuln opens backdoor to rogue accounts

The widespread vBulletin CMS has a vulnerability that allows remote attackers to create new administrative accounts.

Back in August, users of versions in the 4.1+ and 5+ series were advised to delete the /install/ or /core/install/ directories (depending on version) as a workaround against the bug, but vBulletin didn't advise of the impact of the problem.